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Effect of AlN Substitutions on the Oxidation Behavior of ZrB2-SiC Composites at 1600 degrees C

TitleEffect of AlN Substitutions on the Oxidation Behavior of ZrB2-SiC Composites at 1600 degrees C
Publication TypeJournal Article
Year of Publication2016
AuthorsOuyang, GY, Ray, PK, Kramer, MJ, Akinc, M
JournalJournal of the American Ceramic Society
Volume99
Pagination3389-3397
Date Published10
Type of ArticleArticle
ISBN Number0002-7820
Accession NumberWOS:000387223200032
Keywordsaln, convection, diboride-silicon carbide, evolution, high-temperature ceramics, liquids, Materials Science, Microstructure, oxidation, oxide-films, SiC, sic content, sintering aid, UHTC, viscosity, zrb2
Abstract

= 10 vol%) were found to result in marginal improvement in the oxidation resistance, whereas larger amounts resulted in a significant deterioration. The size of ZrO2 clusters formed on the oxidized surface was found to be a function of the AlN content. This effect was more pronounced after longer oxidation times (similar to 1 h) as opposed to shorter durations (similar to 5 min). It was postulated that presence of AlN results in the formation of Al2O3 during the oxidation process, subsequently resulting in a lowering of viscosity of the glassy silica scale, which facilitates the coarsening of ZrO2 clusters. This also increases oxygen permeation through the scale which adversely affects the oxidation resistance of the high AlN content composites.

DOI10.1111/jace.14345
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Short TitleJ. Am. Ceram. Soc.
Alternate JournalJ. Am. Ceram. Soc.